Abstract
Expecting that the root pressure of sugar cane may have some relation to its drought resistance, the experiments presented here were carried out by measuring the degree of the root pressure and the root pressure-holding power of young seedlings of some sugar cane varieties. The results obtained are as follows: 1. When the water content was enough in the soil the strength of the root pressure was nearly corresponding to the root development (dry matter weight of root), but had no close relation to the drought resistance. 2. Difference of the root pressure-holding power of sugar cane varieties, during the water content in the soil being very poor by stopping irrigation, had pretty conspicuous relation to the drought resistance of varieties. That is, the seedlings which showed high root pressure-holding power approximately belonged to drought resistant variety. 3. Difference of the root pressure-holding power had no conspicuous relation to the root development. It seems that threr will be other factors which affect more on the root pressure-holding power than the root development.
